The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.
"This book is something more than a revision of the author's Essentials in mediæval and modern history ... practically a new work. It has been deemed best, therefore, to give the book a distinctive name, and at the same time to continue the publication of the old volume"--Pref
"Appendix: List of books suitable for a high school library": 4 p. following p. 752